Code
library(tidyverse)
library(patchwork)
library(maps) # Original maps package (mostly outdated, but can still be used for simple maps)
library(usmap) # US map that includes Alaska and Hawaii
library(mapdata) # Extra map databases (supplment to maps package; world map is out-dated)
library(ggmap) # Allows use of Stamen and Google maps with ggplot2
library(sf) # Simple Features for R (modern way to work with spatial data)